I installed (apt-get) trousers on Unbuntu and am able to use PKCS11 calls to 
generate keys using the TPM and able to C_Sign etc for about 50 cycles of 
C_Initialize, .. C_Login, C_Sign, C_GetAttributes, etc.., C_Logout, C_Finalize. 
 Then things start heading south with responses to C_Login of 
CKR_FUNCTION_FAILED then CKR_ATTRIBUTE_SENSITIVE.  

Restarting things (/etc/init.d/opencryptoki restart) does not fix it.

Only a reboot of the machine fixes it.

Any clues?  Is this a resource freeing problem?

I do not have this problem with other pkcs11 libs (AEP, Athena, opensc, etc...).

Any pointers would be helpful.

Thank you,
-Rick

DNSSEC Program Manager


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